DM-40699: Restore too long pseudo filename error.

[MichelleGower]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 94.59% and project coverage change: +7.29% 🎉

Comparison is base (025dbbc) 32.74% compared to head (110febb) 40.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   32.74%   40.03%   +7.29%     
==========================================
  Files           8        9       +1     
  Lines         510      547      +37     
  Branches       90       94       +4     
==========================================
+ Hits          167      219      +52     
+ Misses        339      319      -20     
- Partials        4        9       +5     

Files Changed	Coverage Δ
tests/test_utils.py	91.66% <91.66%> (ø)
python/lsst/ctrl/bps/panda/cmd_line_embedder.py	82.69% <100.00%> (+30.60%)	⬆️
tests/test_cmd_line_embedder.py	96.36% <100.00%> (+0.71%)	⬆️

... and 1 file with indirect coverage changes

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